China's conventional extruders and production lines are gradually becoming popular in the international market with excellent cost performance. At the same time, China has continuously innovated in the field of advanced extrusion technology and has developed a variety of new extrusion products. Precision extrusion technology meets the needs of high precision machining
Melt gear pump
Precision extrusion molding can eliminate the need for subsequent processing methods, better meet the needs of product applications, and at the same time achieve the purpose of reducing material costs and improving product quality. Nowadays, in order to meet the needs of precision direct extrusion of plastic products, a variety of mature technologies have been introduced to the market, and polymer melt gear pumps are one of the important means. This technology has been widely used in chemical fiber, film, profile, pipe, sheet, cable, composite extrusion, granulation and other production lines.
After many years of research on the system of melt gear pumps, Beijing University of Chemical Technology, Rubber and Plastic Machinery Research Institute has successfully completed the development and development of plastic melt gear pumps. Now it is able to design and manufacture plastic melt gear pump products such as 28/28 (center Distance/tooth width), 56/56, 70/70, 90/90, etc., the maximum inlet and outlet pressure difference can reach 30MPa, which can meet the requirements of different production, and has been applied in practice and achieved good results. The Rubber and Plastic Machinery Research Institute of Beijing University of Chemical Technology designed and developed the 115-integrated gear pump extruder through in-depth research on the integrated gear pump extruder.
Gear pumps are also beneficial for precision molding in the rubber industry. In order to meet the domestic demand for rubber melt gear pumps, Beijing University of Chemical Technology has cooperated with Beijing Aviation Manufacturing Engineering Research Institute and Hangzhou Chaoyang Rubber Co., Ltd. to jointly develop XCP150/100 and XCP120/90 rubber melt gear pumps. Out of the unit. This unit has ideal working characteristics, ensuring a linear relationship between the amount of extrusion and the speed of the gear pump, which can achieve precise control of production and improve the dimensional accuracy of the product.
Multi-layer coextrusion technology matures
The multi-layer composite technology utilizes materials with medium and high barrier properties to be combined with other packaging materials to combine the high barrier properties of barrier materials with the low cost or special mechanical and thermal properties of other materials to achieve specific functional requirements. The structural design of the co-extruded composite film is gradually required to systematically achieve the ideal state of integrating functions, technology, cost, environmental protection, safety and secondary processing, so that the possibility of maximizing the number of composite layers becomes the technology pursued by suppliers. one. The six-layer composite film co-extrusion blow molding technology of Guangdong Jinming Plastic Equipment Co., Ltd. can be described as a typical example of China's development in this field.
The key technologies used in the seven-layer composite film co-extrusion blow molding unit include: two short-length and long-pitch screw plasticizing extrusion systems, engineering analysis software for vibration-induced plasticizing device optimization design, flat valve plus forming die And inclined valve plus molding die, internal cooling technology and double air pressure negative pressure cooling technology, multi-component weight loss metering feeding, online film thickness precision control system, computer centralized automatic control system and bus control (CANOPEN) technology.
At the same time as the number of layers increases, the film production technology that adapts to special functions is also one of the hot spots in the development of the market. Guangdong Shicheng Company designed and manufactured a PP environmentally friendly wood grain film casting production line with a width of 3150mm. The production capacity of the line exceeds 800kg/h. The screw is designed for high-speed shearing and mixing, and high-efficiency plasticizing screw. Customers can directly use high-filled calcium carbonate powder and inorganic pigment toner, thus saving expensive raw material costs. In addition to the production of PP environmentally friendly wood grain film, the whole line can also flexibly convert and produce other products and broaden the types of customers' products. In the trial production process of Shicheng Company, not only the beautiful PP wood grain film was produced, but also the CPP film, PP stationery film and PP stationery sheet.